Question

Suppose the hypothetical processor of Figure 1.3 also has two I/O instructions:
0011 = Load AC from I/O
0111 = Store AC to I/O
In these cases, the 12-bit address identifies a particular external device. Show the program execution (using format of Figure 1.4) for the following program:
1. Load AC from device 5.
2. Add contents of memory location 940.
3. Store AC to device 6.
Assume that the next value retrieved from device 5 is 3 and that location 940 contains a value of 2.


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  • CreatedMay 09, 2015
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